US5227902A - Spatial light modulator with a photoconductor on each side of a light modulation layer - Google Patents

Spatial light modulator with a photoconductor on each side of a light modulation layer Download PDF

Info

Publication number
US5227902A
US5227902A US07/700,475 US70047591A US5227902A US 5227902 A US5227902 A US 5227902A US 70047591 A US70047591 A US 70047591A US 5227902 A US5227902 A US 5227902A
Authority
US
United States
Prior art keywords
light
information
reading
writing
modulator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/700,475
Inventor
Itsuo Takanashi
Shintaro Nakagaki
Ichiro Negishi
Tetsuji Suzuki
Fujiko Tatsumi
Ryusaku Takahashi
Keiichi Maeno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Assigned to VICTOR COMPANY OF JAPAN LTD. reassignment VICTOR COMPANY OF JAPAN LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MAENO, KEIICHI, NAKAGAKI, SHINTARO, NEGISHI, ICHIRO, SUZUKI, TETSUJI, TAKAHASHI, RYUSAKU, TAKANASHI, ITSUO, TATSUMI, FUJIKO
Application granted granted Critical
Publication of US5227902A publication Critical patent/US5227902A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/135—Liquid crystal cells structurally associated with a photoconducting or a ferro-electric layer, the properties of which can be optically or electrically varied
    • G02F1/1354—Liquid crystal cells structurally associated with a photoconducting or a ferro-electric layer, the properties of which can be optically or electrically varied having a particular photoconducting structure or material
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F3/00—Optical logic elements; Optical bistable devices

Definitions

  • the present invention relates to a spatial light modulator suitable for display apparatus, camera apparatus and optical computers and the like, and more particularly, to an improved spatial light modulator with respect to two items of information.
  • FIG. 1 A conventional spatial light modulator is shown in FIG. 1.
  • a spatial light modulator 11 has laminates of a photoconductive layer 5 and a light modulation layer 7 between transparent electrodes 1 and 3.
  • a drive source 9 is connected between the transparent electrodes 1 and 3.
  • Information writing is performed by irradiation of a writing light that includes the information, as shown by an arrow F1. More specifically, the electric resistance of the photoconductive layer 5 changes in accordance with optical intensity of the writing light, and a charge image corresponding to the information that is to be written is formed at the boundary between the photoconductive layer 5 and the light modulation layer 7.
  • the reading of the written information is performed by allowing a read light to pass through the spatial light modulator 11 as shown by the arrow F2.
  • the light modulation layer 7 is applied with an electric field caused by the charge image that has been formed corresponding with the write information, and is in a status where light modulation is performed so as to correspond to the intensity of this field. Because of this, the reading light is modulated in its intensity or polarization plane corresponding to the information written in the light modulation layer 7 and light-to-light conversion is performed.
  • the present invention has as an object the provision of a spatial light modulator in which information is written by a writing light due to the photoelectric effect and from which the information is read out by a reading light due to light modulation.
  • the modulator comprises a first photoconductive layer exhibiting the photoelectric effect on a writing light carrying a first information, a light modulation layer laminated to the first photoconductive layer, which optically modulates the reading light and a second photoconductive layer laminated to the light modulation layer so as to sandwich, with the first photoconductive layer, the light modulation layer therebetween, exhibiting the photoelectric effect on a writing light carrying a second information.
  • the spatial light modulator of the present invention there is provided a photoconductive layer with respect to each of the two surface of the light modulation layer and so there is the effect that it is possible to handle two images by a simple method.
  • FIG. 1 is a view describing a conventional embodiment
  • FIG. 2 and FIG. 3 are views describing a first embodiment of a spatial light modulator according to the present invention.
  • FIG. 4 is a view describing a second embodiment of a spatial light modulator according to the present invention.
  • a spatial light modulator 22 comprises transparent electrodes 10 and 12 and successive lamination of a first photoconductive layer 14, a light modulation layer 16 and a second photoconductive layer 18 between the electrodes 10 and 12.
  • a drive power source 20 is connected between the transparent electrodes 10 and 12.
  • the transparent electrodes 10 and 12 are formed by ITO (Indium-Tin Oxide) or the like.
  • the photoconductive layers 14 and 18 are formed by an organic photosensitive substance such as PVK (PolyVinyl Carbazole), an azo-system photosensitive substance or phthalocyanine, electro-optical crystal BSO (Bismuth Silicon Oxide), amorphous silicon or the like.
  • the light modulation layer 16 is for example, formed by a high-polymer crystal dispersion membrane that operates by a scattering mode or a TN (Twist Nematic) type of crystal that demonstrates a birefringent characteristic or an photoelectric crystal such as niobic acid lithium for example.
  • the first writing light R10 that performs information writing to the first photoconductive layer 14, is irradiated to the spatial light modulator 22 as shown by an arrow F10.
  • the second writing light R12 that performs writing of information to the second photoconductive layer 18 is irradiated to the spatial light modulator 22 as shown by an arrow F12.
  • the reading light R14 that performs reading of information to the light modulation layer 16 is irradiated to the spatial light modulator 22 as shown by an arrow F14 (or its opposite) in FIG. 3.
  • the optical characteristics of the first photoconductive layer 14 is high sensitive to the first writing light R10, but is of lower sensitivity and transparent to the reading light R14, and that of the second photoconductive layer 18 is highly sensitive to the second writing light R12, but is of low sensitivity and transparent to the reading light R12.
  • the drive power source 20 applies a voltage between the transparent electrodes 10 and 12.
  • each of the first and second writing lights R10 and R12 are irradiated to the spatial light modulator 22.
  • the electric resistance of the first and second photoconductive layers 14 and 18 are changed in accordance with the intensity distribution of the first and the second writing lights R10 and R12.
  • the voltage applied by the drive power source 20 may be set so that the charge image formed at the boundary of the photoconductive layer 14 and the light modulation layer 16 is not affected by the second writing light R12 or the other charge image is not affected by the first writing light R10.
  • the reading light R14 is irradiated to the spatial light modulator 22.
  • the first photoconductive layer 14 is transparent with respect to the reading light R14, and so the reading light R14 is irradiated to the light modulation layer 16 after passing through the first photoconductive layer 14. Because of the electric fields caused by the charge images of the information written on both sides of the light modulation layer 16, the reading light R14 is modulated corresponding to the electric field caused by the two written information, and is output through the second photoconductive layer 18.
  • the second photoconductive layer 18 is transparent to the reading light, and thus the reading light so modulated suffers no attenuation.
  • AND (logical product) or OR (logical sum) operation with respect to the two items of information can be performed according as the field strength generated by the charge image formed by the first and the second writing light R10 and R12, and the voltage applied between the electrodes 10 and 20.
  • the light modulation layer has an upper and a lower threshold relating to the electric field applied on.
  • the modulation effect of the light modulation layer starts at the lower threshold and then saturates at the upper threshold.
  • the two items of information are written on both sides of the light modulation layer, respectively. Because of this, for example, after the spatial light modulator has been assembled into a required apparatus, the operation of changing the inclination of the spatial light modulator is facilitated.
  • the optical characteristics of a second photoconductive layer 30 are set so that there is a high sensitivity with respect to the second writing light R12, and so that it reflects the reading light R16.
  • the other portions of this embodiment are the same as those of the first embodiment.
  • the writing of information is the same as that described above for the first embodiment (see FIG. 2).
  • the reading light R16 is irradiated to a spatial light modulator 24 as shown by an arrow F16.
  • This reading light R16 is irradiated to the light modulation layer 16 in the same manner as for the first embodiment.
  • the reading light R16 receives light modulation corresponding to the writing information and is outputted to the side of the second photoconductive layer 30.
  • the second photoconductive layer 30 operates as a mirror surface with respect to the reading light R16 and so the reading light R16 is reflected and is outputted to the irradiation side of the spatial light modulator 24.
  • the second photoconductive layer 30 operates as a mirror surface with respect to the reading light R16 and so the reading light R16 is reflected and is outputted to the irradiation side of the spatial light modulator 24.
  • the present invention is not limited to the embodiments described above.
  • the writing of information need not necessarily be simultaneous.
  • the erasing of information can be performed by the irradiation of appropriate light to the photoconductive layers 14 and 18 by short-circuiting the transparent electrodes 10 and 12.
  • alternating current When alternating current is used as the power source 20, information reading and writing is performed simultaneously. When this is done, stopping information writing performs the erasing of information.
  • the light modulation layer 16 had no memory characteristic but when there is a memory characteristic, it is possible to use either alternating current or direct current as the drive power source, and the writing and reading of information can be performed either simultaneously or independently of each other.
  • Erasing of information in this case can be performed by impressing heat when a high polymer-liquid crystal film is used as the light modulation layer, or by impressing an intense electric field when a PLZT (lead lanthanum zirconate titanate) is used as the light modulation layer, or by impressing a reverse electric field when a liquid crystal with a strong dielectric characteristic is used.
  • PLZT lead lanthanum zirconate titanate
  • the erasing of information in such a case can be performed by erasing only one of the items of information and then rewriting.
  • the writing and the reading can be performed by surface irradiation of light with respect to the spatial light modulator or can be performed by beam scan.
  • the drive method for the spatial light modulator that is, the information writing, reading and erasing method can also be performed using various methods without being limited to the embodiment described above.
  • the light can be visible light, infrared light, ultraviolet light or light of some other electromagnetic radiation as long as the operation is the same.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)

Abstract

A spatial light modulator which includes a light modulation layer which is interposed between two photoconductive layers and laminated to both layers; the two photo conductive layers have charge images written thereon, respectively, by illumination of a writing light carrying optical information; the illumination direction of the writing light to the photoconductive layers are different from each other; and the two photoconductive layers permit the reading light to pass therethrough. When illuminated by a reading light via either of the first or second photoconductive layers, the light modulation layer optically modulates the reading light in accordance with the first and second charge images, under the presence of a voltage applied to the modulator. Thus it reads read out the first information and second information. The first and second photoconductive layers permit the reading light to pass therethrough.

Description

BACKGROUND OF THE INVENTION
The present invention relates to a spatial light modulator suitable for display apparatus, camera apparatus and optical computers and the like, and more particularly, to an improved spatial light modulator with respect to two items of information.
A conventional spatial light modulator is shown in FIG. 1. In the figure, a spatial light modulator 11 has laminates of a photoconductive layer 5 and a light modulation layer 7 between transparent electrodes 1 and 3. A drive source 9 is connected between the transparent electrodes 1 and 3.
Information writing is performed by irradiation of a writing light that includes the information, as shown by an arrow F1. More specifically, the electric resistance of the photoconductive layer 5 changes in accordance with optical intensity of the writing light, and a charge image corresponding to the information that is to be written is formed at the boundary between the photoconductive layer 5 and the light modulation layer 7.
The reading of the written information is performed by allowing a read light to pass through the spatial light modulator 11 as shown by the arrow F2. The light modulation layer 7 is applied with an electric field caused by the charge image that has been formed corresponding with the write information, and is in a status where light modulation is performed so as to correspond to the intensity of this field. Because of this, the reading light is modulated in its intensity or polarization plane corresponding to the information written in the light modulation layer 7 and light-to-light conversion is performed.
However, in such conventional technology, when two items of different information are to be handled at the same time, it is necessary to provide two spatial light modulators and it is necessary to have a synthesis operation of the read images.
SUMMARY OF THE INVENTION
In the light of these problems described above, the present invention has as an object the provision of a spatial light modulator in which information is written by a writing light due to the photoelectric effect and from which the information is read out by a reading light due to light modulation.
The modulator comprises a first photoconductive layer exhibiting the photoelectric effect on a writing light carrying a first information, a light modulation layer laminated to the first photoconductive layer, which optically modulates the reading light and a second photoconductive layer laminated to the light modulation layer so as to sandwich, with the first photoconductive layer, the light modulation layer therebetween, exhibiting the photoelectric effect on a writing light carrying a second information.
According to the spatial light modulator of the present invention, there is provided a photoconductive layer with respect to each of the two surface of the light modulation layer and so there is the effect that it is possible to handle two images by a simple method.
The other objects and features of this invention will become understood from the following description with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a view describing a conventional embodiment;
FIG. 2 and FIG. 3 are views describing a first embodiment of a spatial light modulator according to the present invention; and
FIG. 4 is a view describing a second embodiment of a spatial light modulator according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The following is a detailed description of a first embodiment of the spatial light modulator of the present invention, with reference to the appended drawings.
The description will begin with a description of a first embodiment of the spatial light modulator of the present invention, with reference to FIG. 2 and FIG. 3. In FIG. 2, a spatial light modulator 22 comprises transparent electrodes 10 and 12 and successive lamination of a first photoconductive layer 14, a light modulation layer 16 and a second photoconductive layer 18 between the electrodes 10 and 12. A drive power source 20 is connected between the transparent electrodes 10 and 12.
The transparent electrodes 10 and 12 are formed by ITO (Indium-Tin Oxide) or the like. In addition, the photoconductive layers 14 and 18 are formed by an organic photosensitive substance such as PVK (PolyVinyl Carbazole), an azo-system photosensitive substance or phthalocyanine, electro-optical crystal BSO (Bismuth Silicon Oxide), amorphous silicon or the like. Furthermore, the light modulation layer 16 is for example, formed by a high-polymer crystal dispersion membrane that operates by a scattering mode or a TN (Twist Nematic) type of crystal that demonstrates a birefringent characteristic or an photoelectric crystal such as niobic acid lithium for example.
The first writing light R10 that performs information writing to the first photoconductive layer 14, is irradiated to the spatial light modulator 22 as shown by an arrow F10. In addition, the second writing light R12 that performs writing of information to the second photoconductive layer 18 is irradiated to the spatial light modulator 22 as shown by an arrow F12. Furthermore, the reading light R14 that performs reading of information to the light modulation layer 16 is irradiated to the spatial light modulator 22 as shown by an arrow F14 (or its opposite) in FIG. 3.
In this embodiment, it is desirable that the optical characteristics of the first photoconductive layer 14 is high sensitive to the first writing light R10, but is of lower sensitivity and transparent to the reading light R14, and that of the second photoconductive layer 18 is highly sensitive to the second writing light R12, but is of low sensitivity and transparent to the reading light R12.
The following is a description of the operation of the first embodiment as described above. In the following description it is assumed that the light modulation layer 16 does not exhibit a memory function. For writing to and reading from the spatial light modulator 22, the drive power source 20 applies a voltage between the transparent electrodes 10 and 12. In this status, as shown in FIG. 2, each of the first and second writing lights R10 and R12 are irradiated to the spatial light modulator 22. The electric resistance of the first and second photoconductive layers 14 and 18 are changed in accordance with the intensity distribution of the first and the second writing lights R10 and R12. This results in charge images corresponding to the intensity distribution of the first and second writing lights R10 and R12, that is, the information to be written is formed at the boundary of the light modulation layer 16 and the photoconductive layers 14 and 15. The voltage applied by the drive power source 20 may be set so that the charge image formed at the boundary of the photoconductive layer 14 and the light modulation layer 16 is not affected by the second writing light R12 or the other charge image is not affected by the first writing light R10.
For reading the information so written, as shown in FIG. 3, the reading light R14 is irradiated to the spatial light modulator 22. The first photoconductive layer 14 is transparent with respect to the reading light R14, and so the reading light R14 is irradiated to the light modulation layer 16 after passing through the first photoconductive layer 14. Because of the electric fields caused by the charge images of the information written on both sides of the light modulation layer 16, the reading light R14 is modulated corresponding to the electric field caused by the two written information, and is output through the second photoconductive layer 18.
As described above, the second photoconductive layer 18 is transparent to the reading light, and thus the reading light so modulated suffers no attenuation.
AND (logical product) or OR (logical sum) operation with respect to the two items of information can be performed according as the field strength generated by the charge image formed by the first and the second writing light R10 and R12, and the voltage applied between the electrodes 10 and 20.
In general, the light modulation layer has an upper and a lower threshold relating to the electric field applied on. The modulation effect of the light modulation layer starts at the lower threshold and then saturates at the upper threshold.
Therefore, where the field strength generated by any one of the information which is written on the both sides of the light modulation layer 16 and voltage applied between the electrodes 10 and 12 reaches at the upper threshold, the information written is ORed.
On the other hand, where the field strength generated in the same manner is lower than the lower threshold and where the field strength generated by the information written on the both sides of the layer 16 and the applied voltage exceeds the lower threshold, the information written is ANDed.
As has been described above, according to the present embodiment, the two items of information are written on both sides of the light modulation layer, respectively. Because of this, for example, after the spatial light modulator has been assembled into a required apparatus, the operation of changing the inclination of the spatial light modulator is facilitated.
The following is a description of a second embodiment of the present invention, with respect to FIG. 4. Moreover, those portions of this embodiment that correspond to portions of the first embodiment described above, are indicated with corresponding numerals.
In this second embodiment, the optical characteristics of a second photoconductive layer 30 are set so that there is a high sensitivity with respect to the second writing light R12, and so that it reflects the reading light R16. The other portions of this embodiment are the same as those of the first embodiment.
The following is a description of the operation of this second embodiment. The writing of information is the same as that described above for the first embodiment (see FIG. 2). When there is the reading of information, the reading light R16 is irradiated to a spatial light modulator 24 as shown by an arrow F16. This reading light R16 is irradiated to the light modulation layer 16 in the same manner as for the first embodiment. And in the light modulation layer 16, the reading light R16 receives light modulation corresponding to the writing information and is outputted to the side of the second photoconductive layer 30.
However, in this second embodiment, the second photoconductive layer 30 operates as a mirror surface with respect to the reading light R16 and so the reading light R16 is reflected and is outputted to the irradiation side of the spatial light modulator 24. In this embodiment as well, it is possible to obtain an effect the same as that of the first embodiment described above.
Moreover, the present invention is not limited to the embodiments described above. For example, it is possible to have appropriate settings corresponding to the necessity of shape and material for each portion. The writing of information need not necessarily be simultaneous.
In the previous embodiments, the erasing of information can be performed by the irradiation of appropriate light to the photoconductive layers 14 and 18 by short-circuiting the transparent electrodes 10 and 12.
When alternating current is used as the power source 20, information reading and writing is performed simultaneously. When this is done, stopping information writing performs the erasing of information. In addition, with the previously described embodiment, it was assumed that the light modulation layer 16 had no memory characteristic but when there is a memory characteristic, it is possible to use either alternating current or direct current as the drive power source, and the writing and reading of information can be performed either simultaneously or independently of each other. Erasing of information in this case can be performed by impressing heat when a high polymer-liquid crystal film is used as the light modulation layer, or by impressing an intense electric field when a PLZT (lead lanthanum zirconate titanate) is used as the light modulation layer, or by impressing a reverse electric field when a liquid crystal with a strong dielectric characteristic is used.
The erasing of information in such a case can be performed by erasing only one of the items of information and then rewriting.
In addition, for example, the writing and the reading can be performed by surface irradiation of light with respect to the spatial light modulator or can be performed by beam scan. In this manner, the drive method for the spatial light modulator, that is, the information writing, reading and erasing method can also be performed using various methods without being limited to the embodiment described above. In the present invention, the light can be visible light, infrared light, ultraviolet light or light of some other electromagnetic radiation as long as the operation is the same.

Claims (2)

What is claimed is:
1. A spatial light modulator comprising:
a first photoconductive layer on which a first charge image corresponding to a first information is written, when illuminated by a first writing light carrying said first information;
a second photoconductive layer on which a second charge image corresponding to a second information is written, when illuminated by a second writing light carrying said second information;
an illumination direction of said second writing light being different from an illumination direction of said first writing light;
a light modulation layer interposed between said first and second photoconductive layers which optically modulates a reading light in accordance with said first and second charge images while under the presence of a voltage applied to said modulator, thereby reading a combination of said first and said second information; and
said first and second photoconductive layers permitting said reading light to pass therethrough.
2. A spatial light modulator comprising:
a first photoconductive layer on which a first charge image corresponding to a first information is written, when illuminated by a first writing light carrying said first information;
a second photoconductive layer on which a second charge image corresponding to a second information is written, when illuminated by a second writing light carrying said second information;
an illumination direction of said second writing light being different from an illumination direction of said first writing light;
a light modulation layer interposed between said first and second photoconductive layers which optically modulates a reading light in accordance with said first and second charge images while under the presence of a voltage applied to said modulator, thereby reading a combination of said first and said second information; and
said first photoconductive layer permitting said reading light to pass therethrough and said second photoconductive layer having a layer portion which reflects said reading light.
US07/700,475 1990-05-16 1991-05-15 Spatial light modulator with a photoconductor on each side of a light modulation layer Expired - Lifetime US5227902A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2126316A JPH0421819A (en) 1990-05-16 1990-05-16 Light-light converting element
JP2-126316 1990-05-16

Publications (1)

Publication Number Publication Date
US5227902A true US5227902A (en) 1993-07-13

Family

ID=14932172

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/700,475 Expired - Lifetime US5227902A (en) 1990-05-16 1991-05-15 Spatial light modulator with a photoconductor on each side of a light modulation layer

Country Status (2)

Country Link
US (1) US5227902A (en)
JP (1) JPH0421819A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2284902A (en) * 1993-09-23 1995-06-21 Sharp Kk Integrated electro-optical liquid crystal device and methods of using such a device.
US5587820A (en) * 1993-09-23 1996-12-24 Sharp Kabushiki Kaisha Integrated electro-optical liquid crystal device and method of using such a device
EP0762370A2 (en) * 1995-08-02 1997-03-12 Canon Kabushiki Kaisha Driving method for display apparatus including an optical modulation device
WO2011007144A1 (en) * 2009-07-15 2011-01-20 The Secretary Of State For Defence Optically addressed light valve comprising two photoconducting layers placed on each side of an electro-optical modulator
US8525943B2 (en) 2009-07-15 2013-09-03 The Secretary Of State For Defence In Her Brittanic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Optically addressed light valve

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58190922A (en) * 1982-05-01 1983-11-08 Ricoh Co Ltd Plzt light bulb
JPS63110416A (en) * 1986-10-28 1988-05-14 Sumitomo Electric Ind Ltd Optical image element
JPS63116119A (en) * 1986-11-04 1988-05-20 Sumitomo Electric Ind Ltd Optical image element
FR2610735A1 (en) * 1987-02-06 1988-08-12 Thomson Csf Self-adapting optical dynamic compensator and its use in an optical radiological-imaging system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58190922A (en) * 1982-05-01 1983-11-08 Ricoh Co Ltd Plzt light bulb
JPS63110416A (en) * 1986-10-28 1988-05-14 Sumitomo Electric Ind Ltd Optical image element
JPS63116119A (en) * 1986-11-04 1988-05-20 Sumitomo Electric Ind Ltd Optical image element
FR2610735A1 (en) * 1987-02-06 1988-08-12 Thomson Csf Self-adapting optical dynamic compensator and its use in an optical radiological-imaging system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2284902A (en) * 1993-09-23 1995-06-21 Sharp Kk Integrated electro-optical liquid crystal device and methods of using such a device.
GB2287548A (en) * 1993-09-23 1995-09-20 Sharp Kk Electro-optic device
US5587820A (en) * 1993-09-23 1996-12-24 Sharp Kabushiki Kaisha Integrated electro-optical liquid crystal device and method of using such a device
EP0762370A2 (en) * 1995-08-02 1997-03-12 Canon Kabushiki Kaisha Driving method for display apparatus including an optical modulation device
WO2011007144A1 (en) * 2009-07-15 2011-01-20 The Secretary Of State For Defence Optically addressed light valve comprising two photoconducting layers placed on each side of an electro-optical modulator
GB2471950B (en) * 2009-07-15 2012-04-04 Secr Defence Non linear optical device
CN102483548A (en) * 2009-07-15 2012-05-30 英国国防部 Optically addressed light valve comprising two photoconducting layers placed on each side of an electro-optical modulator
US8525943B2 (en) 2009-07-15 2013-09-03 The Secretary Of State For Defence In Her Brittanic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland Optically addressed light valve
US8736778B2 (en) 2009-07-15 2014-05-27 The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Nothern Ireland Optically addressed light valve comprising two photoconducting layers placed on each side of an electro-optical modulator
CN102483548B (en) * 2009-07-15 2015-12-16 英国国防部 Comprise the optics addressed light valves of two photoconductive layers in every one side of electrooptic modulator

Also Published As

Publication number Publication date
JPH0421819A (en) 1992-01-24

Similar Documents

Publication Publication Date Title
US3744879A (en) Liquid crystal optical processor
JP3198058B2 (en) Image input integrated display device
KR940005972A (en) Liquid crystal device and electronic device using same
US5227902A (en) Spatial light modulator with a photoconductor on each side of a light modulation layer
JP2564626B2 (en) Optical writing type spatial light modulator
JPH05273511A (en) Liquid crystal computing element and image processing system using this element
US5054892A (en) Photo-to-photo conversion element and its applied system
US5309262A (en) Optically addressed light valve system with two dielectric mirrors separated by a light separating element
US5071231A (en) Bidirectional spatial light modulator for neural network computers
EP0403307B1 (en) Method for operating photo-to-photo transducer
US4920417A (en) Photo-to-photo conversion element and its applied system
JP3109283B2 (en) Liquid crystal display
JPH10239703A (en) Space light modulation system and projection type display system
Haas et al. Ultralow‐voltage image intensifiers
JP2967019B2 (en) Driving method of liquid crystal spatial light modulator
JPH05273578A (en) Method for setting intensity of reading out light of optical writing type liquid crystal light valve for emitting reflected light of incident reading light thereon
JPS6375727A (en) Optical shutter
EP0657764B1 (en) Photo-to-photo transducer
JPH0318814A (en) Method for driving light-light conversion element
JPH06102483A (en) Liquid crystal display device
JPH04345131A (en) Information recorder
JPH03246560A (en) Recording method
JPH02125228A (en) Optical write liquid crystal light valve and image output device using the same
JPH04139423A (en) Display device
JPH0460616A (en) Photo-photo conversion element and display device

Legal Events

Date Code Title Description
AS Assignment

Owner name: VICTOR COMPANY OF JAPAN LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:TAKANASHI, ITSUO;NAKAGAKI, SHINTARO;NEGISHI, ICHIRO;AND OTHERS;REEL/FRAME:005853/0555

Effective date: 19910527

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

STCF Information on status: patent grant

Free format text: PATENTED CASE

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FPAY Fee payment

Year of fee payment: 12